136 RATHBUN 



the side of the large claw than on the side of the small one. In males 

 which are young or have not reached their fullest development, the 

 pollex of the large chela is straight, not bent down, and the lower 

 margin of the propodus is convex, not sinuous. The meral joints of 

 the ambulatory legs are wider in the female than in the male, as is 

 the case in other species of the genus. 



Rang^. — This species was first taken by the Thayer Expedition on 

 the coast of Brazil, at Rio Parahyba do Norte, Sao Matheos and Vic- 

 toria. Specimens from these localities are in the Museum of Com- 

 parative Zoology, and one male from the Rio Parahyba do Norte is 

 in the U. S. National Museum. In 1884, the 'Albatross' collected at 

 Jamaica one male, the claw of which was not reproduced at its last 

 shedding. 



Types. — Eight males and one female were taken on the Branner- 

 Agassiz Expedition, among the mangroves on the Rio Parahyba do 

 Norte at Cabedello. Cat. No. 23753. 



Additio?ial locality. — Natal, Rio Grande do Norte; one male. 



UCA SPINICARPA Rathbun. 

 Uca spinicarpa Rathbun, Amer. Nat., xxxiv, 586, 1900. 



Mamanguape stone reef; one male, soft shell. 



This specimen is too shapeless to be determined with certainty, but 

 it appears to be U. spinicarpa^ which has been taken in the Gulf of 

 Mexico on the coast of Alabama, Mississippi, Texas, and Tslexico. 

 The species is distinguished by the truncate anterior margin of the 

 front between the eyes, and the outline of the lateral margins, which 

 are straight and subparallel in their anterior portion, and then curve 

 abruptly inward and backward. The carpus of the large cheliped 

 has a stout spine or tooth at the middle of its inner surface. The in- 

 ner face of the palm has a prominent crest crowned by a single row 

 of large tubercles extending obliquely upward from the lower margin 

 to the cavity in which the carpus fits, thence it turns at a right angle 

 and meets the upper margin ; there are two rows of tubercles at the 

 base of the dactylus; the remainder of the surface is smooth or 

 nearly so. 



UCA LEPTODACTYLA Rathbun. 



hca leptodactyla Rathhun, in Rankin, Ann. N. Y. Acad. Sci., xi, No. 12, 

 227, 1898, and synonymy. 



Mangroves, Rio Parahyba do Norte ; one male. 



